refactor(@angular/build): align environment option parsing with CLI p… #1815

Job	Run time
build	14s
e2e_windows (windows-2025, 22, npm, 3)	40s
lint	2m 24s
e2e_windows (windows-2025, 22, esbuild, 0)	26s
e2e_windows (windows-2025, 22, esbuild, 2)	36s
e2e_windows (windows-2025, 22, npm, 5)	22s
e2e_windows (windows-2025, 22, npm, 0)	29s
e2e_windows (windows-2025, 22, esbuild, 4)	27s
e2e_windows (windows-2025, 22, npm, 1)	44s
e2e_windows (windows-2025, 22, npm, 2)	40s
e2e_windows (windows-2025, 22, esbuild, 1)	33s
e2e_windows (windows-2025, 22, esbuild, 5)	25s
e2e_windows (windows-2025, 22, esbuild, 3)	33s
e2e_windows (windows-2025, 22, npm, 4)	22s
Browser Compatibility Tests	0s
publish-snapshots	0s
test	0s
e2e	0s
e2e-snapshots	0s
e2e-package-managers	0s
	8m 55s

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